@RadicalEcologist EPUB3 supports Audio and Video.Maybe some of the "special" readers won't but I guess all tablets, PCs and smarphones will.I've read several books on bioacoustics, birdsong and whatnot over the last years and was allways quite dissatisfied with how media was handled, which realy destroyed the reading flow for me, or I never listened to any of the material since it was too inconvnient while reading. That's why I wanted to try to create an EPUB with true multimedia integration

@HollyCo26588808 Amazing!